Modal shift in North Atlantic seasonality during the last deglaciation
International audience Changeover from a glacial to an interglacial climate is considered as transitional between two stable modes. Palaeoceanographic reconstructions using the polar foraminifera Neogloboquadrina pachyderma highlight the retreat of the Polar Front during the last deglaciation in ter...
Published in: | Climate of the Past |
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Online Access: | https://hal.archives-ouvertes.fr/hal-02967483 https://hal.archives-ouvertes.fr/hal-02967483/document https://hal.archives-ouvertes.fr/hal-02967483/file/cp-16-265-2020.pdf https://doi.org/10.5194/cp-16-265-2020 |
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ftunivnantes:oai:HAL:hal-02967483v1 2023-05-15T17:14:59+02:00 Modal shift in North Atlantic seasonality during the last deglaciation Brummer, Geert-Jan Metcalfe, Brett Feldmeijer, Wouter Prins, Maarten van 'T Hoff, Jasmijn Ganssen, Gerald Vrije Universiteit Amsterdam Amsterdam (VU) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ANR-10-LABX-0018,L-IPSL,LabEx Institut Pierre Simon Laplace (IPSL): Understand climate and anticipate future changes(2010) 2020 https://hal.archives-ouvertes.fr/hal-02967483 https://hal.archives-ouvertes.fr/hal-02967483/document https://hal.archives-ouvertes.fr/hal-02967483/file/cp-16-265-2020.pdf https://doi.org/10.5194/cp-16-265-2020 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-16-265-2020 hal-02967483 https://hal.archives-ouvertes.fr/hal-02967483 https://hal.archives-ouvertes.fr/hal-02967483/document https://hal.archives-ouvertes.fr/hal-02967483/file/cp-16-265-2020.pdf doi:10.5194/cp-16-265-2020 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.archives-ouvertes.fr/hal-02967483 Climate of the Past, European Geosciences Union (EGU), 2020, 16 (1), pp.265-282. ⟨10.5194/cp-16-265-2020⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2020 ftunivnantes https://doi.org/10.5194/cp-16-265-2020 2022-10-18T23:39:31Z International audience Changeover from a glacial to an interglacial climate is considered as transitional between two stable modes. Palaeoceanographic reconstructions using the polar foraminifera Neogloboquadrina pachyderma highlight the retreat of the Polar Front during the last deglaciation in terms of both its decreasing abundance and stable oxygen isotope values (δ 18 O) in sediment cores. While conventional isotope analysis of pooled N. pachyderma and G. bulloides shells shows a warming trend concurrent with the retreating ice, new single-shell measurements reveal that this trend is composed of two isotopically different populations that are morphologically indistinguishable. Using modern time series as analogues for interpreting downcore data, glacial productivity in the mid-North Atlantic appears limited to a single maximum in late summer, followed by the melting of drifting icebergs and winter sea ice. Despite collapsing ice sheets and global warming during the deglaciation, a second "warm" population of N. pachyderma appears in a bimodal seasonal succession, separated by the subpolar G. bulloides. This represents a shift in the timing of the main plankton bloom from late to early summer in a "deglacial" intermediate mode that persisted from the glacial maximum until the start of the Holocene. When seawater temperatures exceeded the threshold values, first the "cold" (glacial) then the "warm" (deglacial) populations of N. pachyderma disappeared , whilst G. bulloides with a greater tolerance to higher temperatures persisted throughout the Holocene to the present day in the midlatitude North Atlantic. Single-specimen δ 18 O of polar N. pachyderma reveals a steeper rate of ocean warming during the last deglaciation than appears from conventional pooled δ 18 O average values. Article in Journal/Newspaper Neogloboquadrina pachyderma North Atlantic Sea ice Université de Nantes: HAL-UNIV-NANTES Climate of the Past 16 1 265 282 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Brummer, Geert-Jan Metcalfe, Brett Feldmeijer, Wouter Prins, Maarten van 'T Hoff, Jasmijn Ganssen, Gerald Modal shift in North Atlantic seasonality during the last deglaciation |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Changeover from a glacial to an interglacial climate is considered as transitional between two stable modes. Palaeoceanographic reconstructions using the polar foraminifera Neogloboquadrina pachyderma highlight the retreat of the Polar Front during the last deglaciation in terms of both its decreasing abundance and stable oxygen isotope values (δ 18 O) in sediment cores. While conventional isotope analysis of pooled N. pachyderma and G. bulloides shells shows a warming trend concurrent with the retreating ice, new single-shell measurements reveal that this trend is composed of two isotopically different populations that are morphologically indistinguishable. Using modern time series as analogues for interpreting downcore data, glacial productivity in the mid-North Atlantic appears limited to a single maximum in late summer, followed by the melting of drifting icebergs and winter sea ice. Despite collapsing ice sheets and global warming during the deglaciation, a second "warm" population of N. pachyderma appears in a bimodal seasonal succession, separated by the subpolar G. bulloides. This represents a shift in the timing of the main plankton bloom from late to early summer in a "deglacial" intermediate mode that persisted from the glacial maximum until the start of the Holocene. When seawater temperatures exceeded the threshold values, first the "cold" (glacial) then the "warm" (deglacial) populations of N. pachyderma disappeared , whilst G. bulloides with a greater tolerance to higher temperatures persisted throughout the Holocene to the present day in the midlatitude North Atlantic. Single-specimen δ 18 O of polar N. pachyderma reveals a steeper rate of ocean warming during the last deglaciation than appears from conventional pooled δ 18 O average values. |
author2 |
Vrije Universiteit Amsterdam Amsterdam (VU) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ANR-10-LABX-0018,L-IPSL,LabEx Institut Pierre Simon Laplace (IPSL): Understand climate and anticipate future changes(2010) |
format |
Article in Journal/Newspaper |
author |
Brummer, Geert-Jan Metcalfe, Brett Feldmeijer, Wouter Prins, Maarten van 'T Hoff, Jasmijn Ganssen, Gerald |
author_facet |
Brummer, Geert-Jan Metcalfe, Brett Feldmeijer, Wouter Prins, Maarten van 'T Hoff, Jasmijn Ganssen, Gerald |
author_sort |
Brummer, Geert-Jan |
title |
Modal shift in North Atlantic seasonality during the last deglaciation |
title_short |
Modal shift in North Atlantic seasonality during the last deglaciation |
title_full |
Modal shift in North Atlantic seasonality during the last deglaciation |
title_fullStr |
Modal shift in North Atlantic seasonality during the last deglaciation |
title_full_unstemmed |
Modal shift in North Atlantic seasonality during the last deglaciation |
title_sort |
modal shift in north atlantic seasonality during the last deglaciation |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-02967483 https://hal.archives-ouvertes.fr/hal-02967483/document https://hal.archives-ouvertes.fr/hal-02967483/file/cp-16-265-2020.pdf https://doi.org/10.5194/cp-16-265-2020 |
genre |
Neogloboquadrina pachyderma North Atlantic Sea ice |
genre_facet |
Neogloboquadrina pachyderma North Atlantic Sea ice |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.archives-ouvertes.fr/hal-02967483 Climate of the Past, European Geosciences Union (EGU), 2020, 16 (1), pp.265-282. ⟨10.5194/cp-16-265-2020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-16-265-2020 hal-02967483 https://hal.archives-ouvertes.fr/hal-02967483 https://hal.archives-ouvertes.fr/hal-02967483/document https://hal.archives-ouvertes.fr/hal-02967483/file/cp-16-265-2020.pdf doi:10.5194/cp-16-265-2020 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-16-265-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
1 |
container_start_page |
265 |
op_container_end_page |
282 |
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